Longfellow Bridge

The Longfellow Bridge, also known to locals as the "Salt-and-Pepper Bridge" due to the shape of its central towers, carries Route 3 and the Massachusetts Bay Transportation Authority's Red Line across the Charles River to connect Boston's Beacon Hill neighborhood with the Kendall Square area of Cambridge, Massachusetts.

Trying to solve an impossible math problem, Francine scrawls her equations across the Longfellow Bridge in "National Treasure 4: Baby Franny: She's Doing Well: The Hole Story".